PSLEAhmad had 3.4 m of thread. He used some of it to make the figure as shown.
- How much of the thread did Andy use to make the figure? Leave your answer in the simplest form in terms of h.
- If h = 23, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= h + h + h + (2h - 10) + (h + 15)
= h + h + h + 2h + h - 10 + 15
= (6 h + 5) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of thread used if h = 23
= 6 h + 5
= 6(23) + 5
= 138 + 5
= 143 cm
Total length of thread not used
= 340 - 143
= 197 cm
1 cm = 0.01 m
197 cm = 1.97 m
Answer(s): (a) (6h + 5) cm; (b) 1.97 m